When I was a kid I used to being my Game Boy to school. And once in physical education I left my bag with my Gameboy and Pokemon gold and transfer cable in the locker room. And when I came back there was nothing there.
In the next day I thought my friend had hid it from me and pretty much told him to stop with the jokes and he told me that he didn't had it. That's how I knew I was robbed.

Has this ever happened to you?